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foreign [Music] hi my name is James lamine and Im a software engineer at doordash at doordash all of our backend code is written in kotlin so today Im going to talk about a pattern that I use for writing back end apis this pattern makes handling IO Easy by using structured concurrency and functional programming to keep business logic and dios separate the benefit is that youll be able to respond to new product requirements without refactoring keep your code organized and youll learn how to use some cool kotlin features so lets take a look at the problem lets say that youre implementing an API which calls three services the third service depends on the first two so we make the first two calls concurrently and then call the third service now we have a new product requirement and we need to get data from another service again we want to maximize concurrency by calling service t as soon as we have the data that it needs from service B the failure mode that youll run into here is th